Bomb rocks Pakistan's largest city killing 15

KARACHI, Pakistan — Militants attacked a police compound in the heart of Pakistan's largest city Thursday with gunfire and a massive car bomb, leveling the building and killing at least 15 people.

The six gunmen managed to penetrate a high-security area of Karachi that is home to the U.S. Consulate, two luxury hotels and the offices of regional leaders. While no stranger to extremist violence, Karachi has not witnessed this kind of organized assault in recent years.

It was the first major attack against a government target outside the northwestern tribal regions for several months, showing the reach of Islamist militants seeking to overthrow the U.S.-allied government despite efforts to crack down on them over the last three years.